Rockwell Automation RELIANCE ELECTRIC SP500 - E.3.5 Operator Control Stations; E.3.6 I;O Signals

E.3.5
E.3.6
SEN-60204-1, Part 15.2.2: Identification of the Protective Conductor
For insulated conductors, the two-color combination of green and yellow should meet
the following criteria for any given 15 mm length: one of the colors should cover at
least 30% and no more than 70% of the surface, with the other color covering the
remainder of the surface.
Operator Control Stations
The enclosure of an operator’s control station must be constructed of a conductive
metal. The cover of the enclosure should be bonded to the case and not rely on the
hinge for bonding. Standard industrial operator devices, e.g., pushbuttons, switches,
and meters, may be used.
The wiring connecting the operator’s devices to the drive must be run in continuous,
rigid, conductive conduit, continuously-screened armored cable, or equivalent. Note
that the use of flexible metal conduit, open wire, or wire in trays is not acceptable.
Many flexible metal conduit products have not been designed for RF containment and
are not adequate to maintain compliance.
Proper glands must be used to terminate the operator’s control station conduit/cable
at the station and the drive. The gland must secure the cable screen to the conductive
surfaces of the drive and station enclosure. A full 360° screen termination is preferred.
Screen pigtails are not permitted.
I/O Signals
Control (I/O) and signal wiring must be run in continuous, rigid, conductive conduit or
continuously-screened cable as shown in figure E.4. Note that the use of flexible metal
conduit, open wire, or wire in trays is not acceptable. Many flexible metal products
have not been designed for RF containment and are not adequate to maintain
compliance.
Stranded copper wire
i Plastic insulation
Inner plastic sheath
Compact screen of galvanized (tinned) copper or steel braid
Outer plastic jacket
Figure E.4 - I/O Signal Cable
Compliance with Electromagnetic Compatibility Standards E-7